doc: update -externalip documentation in tor.md
doc: update -externalip documentation in tor.md

cdecker/bitcoin,jlopp/statoshi,bitcoinknots/bitcoin,sipsorcery/bitcoin,cdecker/bitcoin,EthanHeilman/bitcoin,JeremyRubin/bitcoin,instagibbs/bitcoin,qtumproject/qtum,GroestlCoin/bitcoin,AkioNak/bitcoin,JeremyRubin/bitcoin,instagibbs/bitcoin,anditto/bitcoin,tecnovert/particl-core,bitcoinsSG/bitcoin,particl/particl-core,yenliangl/bitcoin,mruddy/bitcoin,jambolo/bitcoin,Sjors/bitcoin,prusnak/bitcoin,namecoin/namecore,dscotese/bitcoin,sstone/bitcoin,namecoin/namecore,qtumproject/qtum,cdecker/bitcoin,namecoin/namecoin-core,ElementsProject/elements,jambolo/bitcoin,MarcoFalke/bitcoin,AkioNak/bitcoin,jamesob/bitcoin,mruddy/bitcoin,GroestlCoin/bitcoin,pstratem/bitcoin,jamesob/bitcoin,n1bor/bitcoin,Sjors/bitcoin,fujicoin/fujicoin,kallewoof/bitcoin,andreaskern/bitcoin,achow101/bitcoin,qtumproject/qtum,domob1812/bitcoin,namecoin/namecore,jlopp/statoshi,ElementsProject/elements,lateminer/bitcoin,Xekyo/bitcoin,ElementsProject/elements,particl/particl-core,mruddy/bitcoin,rnicoll/bitcoin,EthanHeilman/bitcoin,yenliangl/bitcoin,Sjors/bitcoin,Xekyo/bitcoin,rnicoll/bitcoin,instagibbs/bitcoin,GroestlCoin/bitcoin,Xekyo/bitcoin,practicalswift/bitcoin,pataquets/namecoin-core,MeshCollider/bitcoin,mm-s/bitcoin,practicalswift/bitcoin,domob1812/namecore,n1bor/bitcoin,ElementsProject/elements,lateminer/bitcoin,n1bor/bitcoin,yenliangl/bitcoin,AkioNak/bitcoin,particl/particl-core,mm-s/bitcoin,sipsorcery/bitcoin,ajtowns/bitcoin,cdecker/bitcoin,fanquake/bitcoin,ElementsProject/elements,fujicoin/fujicoin,jamesob/bitcoin,sstone/bitcoin,lateminer/bitcoin,n1bor/bitcoin,GroestlCoin/GroestlCoin,dscotese/bitcoin,kallewoof/bitcoin,fanquake/bitcoin,rnicoll/bitcoin,anditto/bitcoin,bitcoinsSG/bitcoin,AkioNak/bitcoin,AkioNak/bitcoin,namecoin/namecore,lateminer/bitcoin,bitcoin/bitcoin,apoelstra/bitcoin,practicalswift/bitcoin,mruddy/bitcoin,sstone/bitcoin,kallewoof/bitcoin,dscotese/bitcoin,prusnak/bitcoin,achow101/bitcoin,sipsorcery/bitcoin,pataquets/namecoin-core,qtumproject/qtum,lateminer/bitcoin,fanquake/bitcoin,bitcoin/bitcoin,apoelstra/bitcoin,bitcoinsSG/bitcoin,n1bor/bitcoin,namecoin/namecoin-core,rnicoll/bitcoin,n1bor/bitcoin,andreaskern/bitcoin,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,bitcoinknots/bitcoin,bitcoinsSG/bitcoin,bitcoinknots/bitcoin,jnewbery/bitcoin,AkioNak/bitcoin,domob1812/bitcoin,jamesob/bitcoin,andreaskern/bitcoin,jambolo/bitcoin,namecoin/namecore,mm-s/bitcoin,qtumproject/qtum,jamesob/bitcoin,Sjors/bitcoin,tecnovert/particl-core,fujicoin/fujicoin,apoelstra/bitcoin,EthanHeilman/bitcoin,pataquets/namecoin-core,JeremyRubin/bitcoin,domob1812/bitcoin,particl/particl-core,pstratem/bitcoin,bitcoin/bitcoin,jnewbery/bitcoin,sstone/bitcoin,practicalswift/bitcoin,practicalswift/bitcoin,apoelstra/bitcoin,prusnak/bitcoin,prusnak/bitcoin,jlopp/statoshi,achow101/bitcoin,jambolo/bitcoin,achow101/bitcoin,MarcoFalke/bitcoin,Sjors/bitcoin,lateminer/bitcoin,ajtowns/bitcoin,fujicoin/fujicoin,jlopp/statoshi,MarcoFalke/bitcoin,Xekyo/bitcoin,GroestlCoin/GroestlCoin,MeshCollider/bitcoin,sstone/bitcoin,jambolo/bitcoin,tecnovert/particl-core,instagibbs/bitcoin,apoelstra/bitcoin,anditto/bitcoin,EthanHeilman/bitcoin,mruddy/bitcoin,jnewbery/bitcoin,domob1812/namecore,GroestlCoin/GroestlCoin,dscotese/bitcoin,Xekyo/bitcoin,pataquets/namecoin-core,domob1812/namecore,tecnovert/particl-core,pataquets/namecoin-core,Xekyo/bitcoin,namecoin/namecore,JeremyRubin/bitcoin,mruddy/bitcoin,pstratem/bitcoin,MeshCollider/bitcoin,namecoin/namecoin-core,prusnak/bitcoin,dscotese/bitcoin,fanquake/bitcoin,EthanHeilman/bitcoin,ajtowns/bitcoin,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,yenliangl/bitcoin,cdecker/bitcoin,yenliangl/bitcoin,kallewoof/bitcoin,jnewbery/bitcoin,bitcoin/bitcoin,tecnovert/particl-core,namecoin/namecoin-core,fujicoin/fujicoin,sipsorcery/bitcoin,bitcoinknots/bitcoin,particl/particl-core,pstratem/bitcoin,bitcoin/bitcoin,dscotese/bitcoin,andreaskern/bitcoin,kallewoof/bitcoin,mm-s/bitcoin,rnicoll/bitcoin,rnicoll/bitcoin,tecnovert/particl-core,ajtowns/bitcoin,apoelstra/bitcoin,MarcoFalke/bitcoin,bitcoin/bitcoin,sipsorcery/bitcoin,namecoin/namecoin-core,GroestlCoin/bitcoin,instagibbs/bitcoin,qtumproject/qtum,jamesob/bitcoin,ElementsProject/elements,sipsorcery/bitcoin,EthanHeilman/bitcoin,achow101/bitcoin,cdecker/bitcoin,domob1812/namecore,namecoin/namecoin-core,jnewbery/bitcoin,prusnak/bitcoin,pataquets/namecoin-core,jlopp/statoshi,jlopp/statoshi,ajtowns/bitcoin,fujicoin/fujicoin,MeshCollider/bitcoin,practicalswift/bitcoin,anditto/bitcoin,GroestlCoin/GroestlCoin,andreaskern/bitcoin,mm-s/bitcoin,JeremyRubin/bitcoin,mm-s/bitcoin,yenliangl/bitcoin,particl/particl-core,domob1812/bitcoin,domob1812/namecore,andreaskern/bitcoin,qtumproject/qtum,GroestlCoin/bitcoin,anditto/bitcoin,pstratem/bitcoin,instagibbs/bitcoin,anditto/bitcoin,MeshCollider/bitcoin,MeshCollider/bitcoin,domob1812/bitcoin,domob1812/namecore,jambolo/bitcoin,fanquake/bitcoin,pstratem/bitcoin,domob1812/bitcoin,kallewoof/bitcoin,bitcoinsSG/bitcoin,GroestlCoin/bitcoin,JeremyRubin/bitcoin,sstone/bitcoin,bitcoinsSG/bitcoin,fanquake/bitcoin,ajtowns/bitcoin,bitcoinknots/bitcoin,achow101/bitcoin